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no spark
just learned that on shut down of throttlebody [code p1516] by ecm the spark is turned off. fyi Login to read more. 
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| Engine | 4.2 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2002 GMC Envoy SLT 4.2L
| Engine | 4.2 L |
| Trans | 4-speed Automatic (Electronic) |
Video